Hey I’m just setting up my profile so I’ll say fast
a) We use the formula:
T = [g sinθ – a] * m
where g is gravity, θ is the angle, a is acceleration, m is mass
T = [9.81 sin37 - 2.00] * 12 = 46.85 N <span>
b) We use the formula for moment of interia:</span>
I = T * r² / a
I = 46.85 * 0.10² / 2.00 = .2343 kg∙m² <span>
c) The formula we can use here is:</span>
w = α * t = (a/r) * t
w = (2/.10) * 2
<span>w = 40 rad/sec</span>
Using the Hubble law v = H₀d where v = recessional speed = 70,000 km per second H₀ = hubble constant = 70 km/s/Mpc and d = distance of galaxy.
Making d subject of the formula, we have
d = v/H₀
Substituting the values of the variables into the equation, we have
d = v/H₀
d = 70000 km/s/70 km/s/Mpc
d = 1000 Mpc
So, the galaxy is 1000 Mpc away from us.
Learn more about hubble law here:
brainly.com/question/18484687
What? on what post the pic
The presence of dark energy has been deduced by studying the movement of stars and galaxies.
Around the 1990's, astronomers studying the rate of expansion of the universe discovered something abnormal. Instead of slowing down due to gravity or even remaining the same, the universe was expanding at an alarming rate.
The rate of expansion was measured using the light coming from supernovae ( massive exploding stars ). While puzzled by this idea, some scientists brought up an old idea by Albert Einstein, also called his "biggest blunder", that there is an energy contained in the vacuum of space that is repulsive and is accelerating the expansion of the universe. This mysterious energy is what is known as dark energy today.
Dark energy, most at times is confused with dark matter. Very little is known about it as of today, as it is invisible because it doesn't react to visible light. The presence of dark energy is therefore studied by monitoring its gravitational pull on distant stars and galaxies.
To learn more about dark energy, visit;
brainly.com/question/24197345
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